Merge pull request #11 from fourstix/b_fix_connection

Added comment to simpletest

Author: fourstix

README.rst

@@ -157,6 +157,24 @@ Usage Example
     # use QwiicJoystick(i2c, address) for a different address
     # joystick = QwiicJoystick(i2c, 0x21)"""
 
+Upgrading
+=========
+On supported GNU/Linux systems like the Raspberry Pi, you can upgrade the driver locally `from
+PyPI <https://pypi.org/project/Sparkfun-circuitpython-qwiicjoystick/>`_.
+
+To upgrade for current user:
+
+.. code-block:: shell
+
+    pip3 install --upgrade sparkfun-circuitpython-qwiicjoystick
+
+To upgrade system-wide (this may be required in some cases):
+
+.. code-block:: shell
+
+    sudo pip3 install --upgrade sparkfun-circuitpython-qwiicjoystick
+
+
 Contributing
 ============
 

examples/qwiicjoystick_simpletest.py

@@ -36,6 +36,7 @@
 
 print("Press Joystick button to exit program.")
 
+# joystick.button goes to 0 when pressed
 while joystick.button == 1:
     print("X = " + str(joystick.horizontal) + " Y = " + str(joystick.vertical))
     sleep(0.200)  # sleep a bit to slow down messages

sparkfun_qwiicjoystick.py

@@ -110,8 +110,12 @@ def __init__(self, i2c, address=QWIIC_JOYSTICK_ADDR, debug=False):
     @property
     def connected(self):
         """True if the Joystick is connected and a valid id is successful read."""
-        if self._read_register(_JOYSTICK_ID) != QWIIC_JOYSTICK_ADDR:
+        try:
+            # Attempt to read the id and see if we get an error
+            self._read_register(_JOYSTICK_ID)
+        except ValueError:
             return False
+
         return True
 
     @property
@@ -195,8 +199,11 @@ def set_i2c_address(self, new_address):
     def _read_register(self, addr):
         # Read and return a byte from the specified 8-bit register address.
         with self._device as device:
+            device.write(bytes([addr & 0xFF]))
             result = bytearray(1)
-            device.write_then_readinto(bytes([addr & 0xFF]), result)
+            device.readinto(result)
+            # For some reason, write_then_readinto returns invalid data
+            # device.write_then_readinto(bytes([addr & 0xFF]), result)
             if self._debug:
                 print("$%02X => %s" % (addr, [hex(i) for i in result]))
             return result[0]